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diff --git a/src/xmlpatterns/schema/qxsdidchelper_p.h b/src/xmlpatterns/schema/qxsdidchelper_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the $MODULE$ of the Qt Toolkit.
+**
+** $TROLLTECH_DUAL_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+
+#ifndef Patternist_XsdIdcHelper_H
+#define Patternist_XsdIdcHelper_H
+
+#include "qreportcontext_p.h"
+#include "qschematype_p.h"
+
+#include <QtXmlPatterns/QXmlItem>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+
+    /**
+     * @short A helper class for validating identity constraints.
+     *
+     * This class represents a field node from the key-sequence as defined in
+     * the validation rules at http://www.w3.org/TR/xmlschema11-1/#d0e32243.
+     */
+    class FieldNode
+    {
+        public:
+            /**
+             * Creates an empty field node.
+             */
+            FieldNode();
+
+            /**
+             * Creates a field node that is bound to a xml node.
+             *
+             * @param item The xml node the field is bound to.
+             * @param data The string content of that field.
+             * @param type The type that is bound to that field.
+             */
+            FieldNode(const QXmlItem &item, const QString &data, const SchemaType::Ptr &type);
+
+            /**
+             * Returns whether this field is empty.
+             *
+             * A field can be empty, if the xpath expression selects an absent attribute
+             * or element.
+             */
+            bool isEmpty() const;
+
+            /**
+             * Returns whether this field is equal to the @p other field.
+             *
+             * Equal means that both have the same type and there content is equal in the
+             * types value space.
+             */
+            bool isEqualTo(const FieldNode &other, const NamePool::Ptr &namePool, const ReportContext::Ptr &context, const SourceLocationReflection *const reflection) const;
+
+            /**
+             * Returns the xml node item the field is bound to.
+             */
+            QXmlItem item() const;
+
+        private:
+            QXmlItem m_item;
+            QString m_data;
+            SchemaType::Ptr m_type;
+    };
+
+    /**
+     * @short A helper class for validating identity constraints.
+     *
+     * This class represents a target or qualified node from the target or qualified
+     * node set as defined in the validation rules at http://www.w3.org/TR/xmlschema11-1/#d0e32243.
+     *
+     * A target node is part of the qualified node set, if all of its fields are not empty.
+     */
+    class TargetNode
+    {
+        public:
+            /**
+             * Defines a set of target nodes.
+             */
+            typedef QSet<TargetNode> Set;
+
+            /**
+             * Creates a new target node that is bound to the xml node @p item.
+             */
+            explicit TargetNode(const QXmlItem &item);
+
+            /**
+             * Returns the xml node item the target node is bound to.
+             */
+            QXmlItem item() const;
+
+            /**
+             * Returns all xml node items, the fields of that target node are bound to.
+             */
+            QVector<QXmlItem> fieldItems() const;
+
+            /**
+             * Returns the number of fields that are empty.
+             */
+            int emptyFieldsCount() const;
+
+            /**
+             * Returns whether the target node has the same fields as the @p other target node.
+             */
+            bool fieldsAreEqual(const TargetNode &other, const NamePool::Ptr &namePool, const ReportContext::Ptr &context, const SourceLocationReflection *const reflection) const;
+
+            /**
+             * Adds a new field to the target node with the given values.
+             */
+            void addField(const QXmlItem &item, const QString &data, const SchemaType::Ptr &type);
+
+            /**
+             * Returns whether the target node is equal to the @p other target node.
+             */
+            bool operator==(const TargetNode &other) const;
+
+        private:
+            QXmlItem m_item;
+            QVector<FieldNode> m_fields;
+    };
+
+    /**
+     * Creates a hash value for the given target @p node.
+     */
+    inline uint qHash(const QPatternist::TargetNode &node)
+    {
+        return qHash(node.item().toNodeModelIndex());
+    }
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif